2D magnetism
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V našem sdělení je ukázána možnost ultrazvukového peroperačního monitoringu v 2D zobrazení v reálném čase u operací maligních mozkových nádorů. Bylo vyhodnoceno 25 pacientů operovaných od června 2001 do dubna 2002 na naší neurochirurgické klinice s diagnózou multiformního glioblastomu. Během resekce byla radikalita výkonu kontrolovaná pomocí operačního mikroskopu a ultrazvukového vyšetření v 2D zobrazení. Díky ultrazvukové kontrole byla radikalita operace u 9 pacientů rozšířena, aniž došlo ke zhoršení předoperačního stavu pacienta. Do 48 hodin po operaci byla provedena kontrolní CT, MRI a ultrazvukové vyšetření. Výsledky těchto vyšetření jsme porovnali s peroperačním nálezem v mikroskopickém a ultrazvukovém obraze. U 21 pacientů došlo ke shodě v hodnocení peroperačního a pooperačního nálezu ve smyslu radikality operace. U dvou pacientů pro špatné temporální okno při ultrazvukovém vyšetření nemohlo být srovnání provedeno. U dalších dvou pacientů bylo prokázáno pooperační krvácení v místě resekce ultrazvukovým a CT vyšetřením. Nemohl být proto srovnán peroperační a pooperační nález. Z prvních zkušeností se zdá, že ultrazvukové peroperační 2D vyšetření může významně pomoci k bezpečné maximální resekci mozkového nádoru.
Our communication demonstrates the feasibility of ultrasound peroperative monitoring in real-time 2D imaging during surgeries for malignant brain tumours. Twenty-five patients were evaluated, who had surgery from June 2001 to April 2002 at Clinic of Neurosurgery for the diagnosis of glioblastoma multiforme. During resection, the radicality of the surgery was verified with the help of a surgical microscope and ultrasound examination in 2D mode. Thanks to ultrasound monitoring, the radicality of the surgery was extended in 9 patients without worsening the preoperative state of the patients. Control CT, MRI and ultrasound examination were performed within 48 hours after surgery. The results of these examinations were compared to the peroperative findings in the microscopic and ultrasound images. In 21 patients, there was agreement of peroperative and postoperative findings regarding the radicality of the surgery. In 2 patients, the comparison could not be made because of an unsatisfactory temporal window during the ultrasound exam. In other two patients, postoperative bleeding at the resection site was demonstrated with an ultrasound and CT exam, therefore, the peroperative and postoperative findings could not be compared. This first experience seems to indicate that peroperative 2D ultrasound examination can significantly contribute to a safe maximal resection of brain tumours.
- MeSH
- dospělí MeSH
- glioblastom chirurgie ultrasonografie MeSH
- lidé středního věku MeSH
- lidé MeSH
- magnetická rezonanční tomografie MeSH
- mikroskopie MeSH
- peroperační monitorování metody MeSH
- počítačová rentgenová tomografie MeSH
- reziduální nádor ultrasonografie MeSH
- ultrasonografie dopplerovská metody přístrojové vybavení MeSH
- Check Tag
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- Publikační typ
- přehledy MeSH
- srovnávací studie MeSH
Congenital epulis is a rare benign oral cavity tumor that usually arises from the maxillary alveolar mucosa. It is also known as congenital gingival granular cell tumor. Prenatal diagnosis is uncommon and mostly confined to the third trimester. We report a case of congenital epulis, which was referred to our department at 35 weeks of gestation. Both images from our prenatal 2D/3D ultrasound (including Doppler technique) and magnetic resonance examination are presented. A baby girl weighing 2,800 g was delivered spontaneously at 36 weeks and 1 day. The newborn had to be intubated immediately after delivery. A simple excision of the mass was performed on the first day of neonatal life after clinical examination by our pediatric stomatologists confirmed the presence of a tumor resembling epulis. The correctness of this diagnosis was subsequently confirmed by histogenesis. Photographs from the operating room show the postnatal appearance of the tumor. The baby was discharged at the age of 19 days and has remained well at follow-up controls.
- MeSH
- dospělí MeSH
- lidé MeSH
- magnetická rezonanční tomografie MeSH
- nádor z granulárních buněk diagnóza embryologie chirurgie ultrasonografie MeSH
- nádory dásní diagnóza embryologie chirurgie ultrasonografie MeSH
- novorozenec MeSH
- prenatální diagnóza * MeSH
- těhotenství MeSH
- třetí trimestr těhotenství MeSH
- ultrasonografie dopplerovská barevná MeSH
- ultrasonografie prenatální MeSH
- výsledek terapie MeSH
- zobrazování trojrozměrné MeSH
- Check Tag
- dospělí MeSH
- lidé MeSH
- novorozenec MeSH
- těhotenství MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- kazuistiky MeSH
- práce podpořená grantem MeSH
Due to the clinically proven benefit of hyperthermia treatments if added to standard cancer therapies for various tumor sites and the recent development of non-invasive temperature measurements using magnetic resonance systems, the hyperthermia community is convinced that it is a time when even patients with brain tumors could benefit from regional microwave hyperthermia, even if they are the subject of a treatment to a vital organ. The purpose of this study was to numerically analyze the ability to achieve a therapeutically relevant constructive superposition of electromagnetic (EM) waves in the treatment of hyperthermia targets within the brain. We evaluated the effect of the target size and position, operating frequency, and the number of antenna elements forming the phased array applicator on the treatment quality. In total, 10 anatomically realistic 2D human head models were considered, in which 10 circular hyperthermia targets with diameters of 20, 25, and 30 mm were examined. Additionally, applicators with 8, 12, 16, and 24 antenna elements and operating frequencies of 434, 650, 915, and 1150 MHz, respectively, were analyzed. For all scenarios considered (4800 combinations), the EM field distributions of individual antenna elements were calculated and treatment planning was performed. Their quality was evaluated using parameters applied in clinical practice, i.e., target coverage (TC) and the target to hot-spot quotient (THQ). The 12-antenna phased array system operating at 434 MHz was the best candidate among all tested systems for HT treatments of glioblastoma tumors. The 12 antenna elements met all the requirements to cover the entire target area; an additional increase in the number of antenna elements did not have a significant effect on the treatment quality.
BACKGROUND: Cardiovascular magnetic resonance (CMR) 2D feature tracking (FT) left ventricular (LV) myocardial strain has seen widespread use to characterize myocardial deformation. Yet, validation of CMR FT measurements remains scarce, particularly for regional strain. Therefore, we aimed to perform intervendor comparison of 3 different FT software against tagging. METHODS: In 61 subjects (18 healthy subjects, 18 patients with chronic myocardial infarction, 15 with dilated cardiomyopathy, and 10 with LV hypertrophy due to hypertrophic cardiomyopathy or aortic stenosis) were prospectively compared global (G) and regional transmural peak-systolic Lagrangian longitudinal (LS), circumferential (CS) and radial strains (RS) by 3 FT software (cvi42, Segment, and Tomtec) among each other and with tagging at 3T. We also evaluated the ability of regional LS, CS, and RS by different FT software vs tagging to identify late gadolinium enhancement (LGE) in the 18 infarct patients. RESULTS: GLS and GCS by all 3 software had an excellent agreement among each other (ICC = 0.94-0.98 for GLS and ICC = 0.96-0.98 for GCS respectively) and against tagging (ICC = 0.92-0.94 for GLS and ICC = 0.88-0.91 for GCS respectively), while GRS showed inconsistent agreement between vendors (ICC 0.10-0.81). For regional LS, the agreement was good (ICC = 0.68) between 2 vendors but less vs the 3rd (ICC 0.50-0.59) and moderate to poor (ICC 0.44-0.47) between all three FT software and tagging. Also, for regional CS agreement between 2 software was higher (ICC = 0.80) than against the 3rd (ICC = 0.58-0.60), and both better agreed with tagging (ICC = 0.70-0.72) than the 3rd (ICC = 0.57). Regional RS had more variation in the agreement between methods ranging from good (ICC = 0.75) to poor (ICC = 0.05). Finally, the accuracy of scar detection by regional strains differed among the 3 FT software. While the accuracy of regional LS was similar, CS by one software was less accurate (AUC 0.68) than tagging (AUC 0.80, p < 0.006) and RS less accurate (AUC 0.578) than the other two (AUC 0.76 and 0.73, p < 0.02) to discriminate segments with LGE. CONCLUSIONS: We confirm good agreement of CMR FT and little intervendor difference for GLS and GCS evaluation, with variable agreement for GRS. For regional strain evaluation, intervendor difference was larger, especially for RS, and the diagnostic performance varied more substantially among different vendors for regional strain analysis.
- MeSH
- funkce levé komory srdeční MeSH
- gadolinium MeSH
- kontrastní látky * MeSH
- lidé MeSH
- magnetická rezonance kinematografická * MeSH
- magnetická rezonanční spektroskopie MeSH
- prediktivní hodnota testů MeSH
- reprodukovatelnost výsledků MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
The aim of this work was to evaluate the possibility to use in vivo (31)P magnetic resonance spectroscopy (MRS) for the diagnosis of kidney graft dysfunction after transplantation. We examined 68 kidney grafted patients using a 1.5 T MR scanner. (31)P MRS was performed using the 2D-chemical shift imaging method. The patients were divided into 4 groups: acute rejection episode; acute tubular necrosis; late graft dysfunction; or good renal function. We measured the signal intensities of phosphomonoesters (PME), inorganic phosphate (Pi), phosphodiesters (PDE), and α-, β-, γ-adenosine triphosphate (ATP; with contributions of α- and β-adenosine diphosphate) and their ratios. Patients with an acute rejection episodes showed a significantly elevated PME/β-ATP and PDE/β-ATP, PME/Pi, and PDE/Pi signal ratios compared with the control group. The group with acute tubular necrosis had decreased ratios. Patients with late graft dysfunction revealed only an insignificant decrease in PME/Pi and PDE/Pi ratios. We concluded that (31)P MRS was capable of distinguishing the two main causes of graft dysfunction early after transplantation.
- MeSH
- dospělí MeSH
- izotopy fosforu MeSH
- ledviny patofyziologie MeSH
- lidé středního věku MeSH
- lidé MeSH
- magnetická rezonanční spektroskopie metody MeSH
- transplantace ledvin MeSH
- Check Tag
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
BACKGROUND: Cardiac magnetic resonance (CMR) plays a major diagnostic role in acute myocarditis (AM) in children as biopsy is rarely performed in this age group. Contribution of standard echocardiography (ECHO) is limited in AM, but speckle tracking echocardiography (STE) quantitatively characterizes myocardial function, with good sensitivity for detecting subclinical left ventricular (LV) dysfunction and regional kinetics disorders beyond the site of inflammation. This work aimed to evaluate the diagnostic potential of STE as compared with CMR findings in pediatric patients with AM. METHODS: The study was conducted during 2022-2023. Troponin, electrocardiography, ECHO with STE, and CMR with early and late enhancement were performed on each patient. Affected heart segments were analyzed by both STE and CMR, and the correlation of the two methods was assessed. RESULTS: During the study period, 20 children were diagnosed with AM [14 boys, 6 girls; mean age 12 years (median 14)]. On ECHO, three patients had a deviation in LV biometry, and four patients had a mild systolic function disorder. STE showed at least one affected cardiac segment in all patients, most often the inferolateral segment (16/20; 80%). Of the 20 patients, STE showed a reduction in LV global longitudinal strain in 13 (65%) patients. In all patients, CMR identified an inflammatory focus, most frequently inferolateral (15/20; 75%). The strongest accordance between STE and CMR was observed for the involvement of anterolateral segments (k = 0.88) and the weakest for inferoseptal damage (k = 0.4). CONCLUSIONS: STE can provide important diagnostic information in pediatric patients with AM. This modality supports the detection of early regional edema and subclinical myocardial dysfunction and can determine the impairment severity. STE is non-invasive and repeatable without the need for special patient preparation or for general anesthesia.
- Publikační typ
- časopisecké články MeSH
Autoři popisují vlastní zkušenosti a morfologický obraz Ebsteinovy malformace srdce při vyšetření magnetickou rezonancí.
The authors describe their own experience and morphological picture of Ebstein heart malformation in the magnetic resonance imaging.
